Hock-drill



NITED STATES PATENT OFFICE..

E. L. FooTri, or srRINIGFIELD, ILLINOIS.

ROCK-DRILL.

Specification of Letters Patent No. 28,569, dated June 5, 1860.

To all 'whom it may concern:

Be it known that I, E. L. Foo'IE, of Springfield, in Sangamon county, and State of Illinois, have invented a new and useful Improvement in Rock-Drills; and I do here by declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawing, making part of this specification, in which- Figure 1 is a top view, Fig. 2 a side elevation, Fig. 3 a front elevation, and Fig. 4 is a section through the line A A of Figs. 2 and 3, and Figs. 5, 6 and 7 are parts of the machine to be hereinafter described.

The following description will enable anyone skilled in the arts to which my invention appertains to make and use the same.

Similar letters of reference represent corresponding parts of the different figures of the drawing annexed.

Upon the drawing A represents the main frame of the machine, and in this main frame there is a movable frame B placed and arranged so as to slide up and down upon the ways or guides C C, made fast in the main frame. The upper end of these ways C are joined together by means of the head frame D. Upon the frame B a pair of supporters H H are erected for the purpose of supporting the shaft G, upon which are fixed two cams I I made inthe form shown in Fig. 3.

Upon the top of the supporters H H a guide bracket l is erected, a top View of which is seen in Fig. 5 upon an enlarged scale. To the top of this bracket small guide ,pieces c c are fixed, through which the small ends b of the drill bars F F are made to work. These guide pieces are fixed over slots in the bracket d, as shown more distinctly in Fig. 5. To the top of the frame B guide pieces l1, z, are fixed, through which the body of the drill bar is made to work. Enlarged views of these pieces are shown in Figs. 6 and 7. The said pieces are fixed to the frame by means of bolts r r which pass through slots J J, so that they may be adjusted to or from each other. A set of these guide pieces are also fixed against the lower side of the frame B to guide the lower end of the drill bar. These guide pieces L h are arranged directly under the guide pieces o c on the bracket (l, which last named guide pieces, being xed over slots in the said bracket, may also be adjusted to or from each other; so that the drill bars F F can be set to drill holes close together or far apart as the case may require.

Upon the upper end of the drill bar the heads o 'v are fixed, against which the cams I I operate, to lift the bars in the operation of drilling; the arrangement is shown in Fig. 4. The lower part of the aforesaid heads consists of a disk, and the upper part of four arms branching from the center outward. In the ends of these arms small rollers are fixed at These rollers when the cam lifts the drill bar, rub against a stop or guide c fixed in the inside of the bracket (Z. These guides are made about equal in length to the throw of the cams I I, and are so set and adjusted as to bring their upper ends, just even with the face of the cams when on their upper throw, so that they (the cams) will just lift the heads o over the top of the stop guides.

Now when the machine is in operation the cam strikes against the disk part of the head o and raises the bar and at the same time turns it until one of the arms m strikes against the stop guide e, against which the arm slides up, until it is lifted over the said slide by the cam, which now turns it-just far enough to let it clear the slide, and then lets it fall on the other side of the said slide and immediately thereafter a succeeding arm is brought against the said slide and so on, the cam turning the drill at the same time and by the same motion that lifts it, until the turning motion is arrested by the arms w against the slide Z, which occurs four times every whole revolution of the drill bar, or as often as there are arms in the head o.

In the top of the bracket Z a hole E is made as in Fig. 5, and through this hole the screw E is made to pass. The said screw is made with a collar on its lower end, to receive and support the bracket d. The upper end of the said screw passes through the head piece I), and by means of the said screw the frame B is raised and lowered in the ways or guides c c, and'by which means the drills are lowered as fast as they advance in the rock.

Having thus described the construction and operation of my machine what I claim as new and desire to secure by Letters Patent is- 1. The combination of the heads fv with the stop guides e tlle cams I, and the drill All of which I respectfully submit this bars F, when the Whole is constructed and 26th day of March 1860.

arranofed substantially as described.

2. IDD ombinaton With the drill bars F E' L FOOTE' 5 the adjustable guides 71 la., and c, c, when In presence ofconstructed, arranged and operated, in the JOHN E. ROSETTE, manner and for the purpose specified. L. B. ADAMS. 

